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ISL6211CA-T Datasheet

  • ISL6211CA-T

  • Crusoe⑩ Processor Core-Voltage Regulator

  • 16頁

  • INTERSIL   INTERSIL

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Crusoe鈩?Processor Core-Voltage
Regulator
I GNS
DE S T
TM
EW
OR N ACEMEN at
r
ED F
L
END ED REP rt Cente ign
M
COM M
Sheet
ND
des
p po
T RE C
Data
E nical Su sil.com/
M
November 2001
O
NO
RE r Tech
inter
.
NO
ou
www
tact RSIL or
con NTE
8-I
1-88
ISL6211
FN9043.1
Features
鈥?High Efficiency Over Wide Load Range
鈥?Loss-Less Current-Sense Scheme
- Uses MOSFET鈥檚 R
DS(ON)
- Optional Current-Sense Resistor for Higher Tolerance
Overcurrent Protection
鈥?Powerful Gate Drivers with Adaptive Dead Time
鈥?Summing Current-Mode Control and On-Chip Active
Droop for Optimum Transient Response
鈥?TTL-Compatible 5-Bit Digital Output Voltage Selection
- Wide Range - 0.6VDC to 1.0VDC in 25mV Steps, and
from 1.0VDC to 1.75VDC in 50mV Steps
- 鈥淥n-the-Fly鈥?VID code change with customer
programmable slew rate
鈥?Alternative Input to Set Output Voltage During Start-up or
Power Saving Modes
鈥?Selectable Forced Continuous Conduction Mode of
Operation
鈥?Power-Good Output Voltage Monitor
鈥?No Negative Core Voltage on Turn-off
鈥?Over-Voltage, Under-Voltage and Over-Current Fault
Monitors
鈥?300/600kHz Selectable Switching Frequency
The ISL6211 is a single-output power-controller to power
core of Transmeta鈥檚 Crusoe鈩?CPU. The ISL6211 includes a
5-bit digital-to-analog converter (DAC) that adjusts the core
PWM output voltage from 0.6VDC to 1.75VDC. The DAC
settings may be changed during operation. Special
measures are taken to allow such a transition with controlled
slew rate to comply with Transmeta鈥檚 LongRun鈩?/div>
technology. A precise reference and a proprietary
architecture with integrated compensation provide excellent
static and dynamic core voltage regulation.
In nominal currents, the controller operates at a selectable
frequency of 300kHz or 600kHz. When the filter inductor
current becomes discontinuous, the controller operates in a
hysteretic mode dramatically improving system efficiency.
The hysteretic mode of operation can be inhibited by a
designated control pin.
The ISL6211 monitors the output voltage. A Power-Good
signal is issued when soft start is completed and the output
is in regulation. A built-in over-voltage protection prevents
the load from seeing output voltages higher than 1.9V.
Under-voltage protection latches the chip off when the
output drops below 75% of the set value. The PWM
controller's over-current circuitry monitors the converter load
by sensing the voltage drop across the lower MOSFET. The
overcurrent threshold is set by an external resistor. If
precision overcurrent protection is required, an external
current-sense resistor may optionally be used.
Applications
鈥?Mobile PCs
鈥?Web Tablets
Pinout
ISL6211 (SSOP)
TOP VIEW
GND
VCC
PGOOD
EN
FCCM
ALTV
FREQ
VID4
VID3
1
2
3
4
5
6
7
8
9
24 PVCC
23 LGATE
22 PGND
21 ISEN
20 PHASE
19 UGATE
18 BOOT
17 NC
16 VSEN
15 OCSET
14 SOFT
13 VIN
鈥?Internet Appliances
Ordering Information
PART NUMBER
ISL6211CA
ISL6211CA-T
TEMP. (
o
C)
-10 to 85
-10 to 85
PACKAGE
24 Ld SSOP
24 Ld SSOP,
Tape and Reel
PKG. NO.
M24.15
M24.15
VID2 10
VID1 11
VID0 12
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2001. All Rights Reserved
Crusoe鈩?and LongRun鈩?are trademarks of Transmeta Corporation.

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